EP2459721A1 - Improved human long pentraxin 3 expression system and uses thereof - Google Patents
Improved human long pentraxin 3 expression system and uses thereofInfo
- Publication number
- EP2459721A1 EP2459721A1 EP10740573A EP10740573A EP2459721A1 EP 2459721 A1 EP2459721 A1 EP 2459721A1 EP 10740573 A EP10740573 A EP 10740573A EP 10740573 A EP10740573 A EP 10740573A EP 2459721 A1 EP2459721 A1 EP 2459721A1
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- European Patent Office
- Prior art keywords
- recombinant
- long pentraxin
- cell
- human
- human long
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
- C12N15/79—Vectors or expression systems specially adapted for eukaryotic hosts
- C12N15/85—Vectors or expression systems specially adapted for eukaryotic hosts for animal cells
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/435—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
- C07K14/705—Receptors; Cell surface antigens; Cell surface determinants
- C07K14/71—Receptors; Cell surface antigens; Cell surface determinants for growth factors; for growth regulators
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
- C12N15/67—General methods for enhancing the expression
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
- C12N15/79—Vectors or expression systems specially adapted for eukaryotic hosts
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N5/00—Undifferentiated human, animal or plant cells, e.g. cell lines; Tissues; Cultivation or maintenance thereof; Culture media therefor
- C12N5/10—Cells modified by introduction of foreign genetic material
- C12N5/12—Fused cells, e.g. hybridomas
- C12N5/16—Animal cells
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N2800/00—Nucleic acids vectors
- C12N2800/10—Plasmid DNA
- C12N2800/106—Plasmid DNA for vertebrates
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N2830/00—Vector systems having a special element relevant for transcription
- C12N2830/50—Vector systems having a special element relevant for transcription regulating RNA stability, not being an intron, e.g. poly A signal
Definitions
- the present invention relates to human derived cellular system able to express high levels of the human pentraxin 3 (hPTX3) protein, methods and material used.
- hPTX3 human pentraxin 3
- Human long pentraxin 3 is a multimeric glycoprotein composed of eight subunits linked by disulphide bridges.
- the authors of the present invention have already designed an expression system for the production of PTX3 in HEK293F human cell line.
- This system is based on a plasmid containing the neomycin resistance gene wherein the PTX3 gene is under the control of a human Ubiquitin C promoter sequence.
- Such system avoids the potential formation of a chimeric PTX3 derived from endogenous production of PTX3 by a cell line of non-human origin.
- the best producer isolated clone, named 2Fl 2 was selected among those obtained. A production of about 20 mg/L of PTX3 was obtained, which was not sufficient for commercial production needs.
- the authors of the present invention have constructed a plasmid in which the PTX3 gene was under CMV promoter control.
- the plasmid was used to re-trans feet the PTX3 expressing clone 2Fl 2.
- the productivity level detected in the new isolated transfectomas was higher that expected, around 80 mg/L.
- a clone of human origin expressing high levels of human PTX3 was obtained using an experimental strategy , including the following steps:
- the vector is preferentially use to transform host cell, preferably wherein the host cell is a recombinant human cell already able to express the human long pentraxin PTX3 protein, more preferably wherein the recombinant human cell is the recombinant 293F/PTX3/2F12 clone deposited at ECACC with no. 08011001.
- the vector is linearized.
- It is another object of the invention a process for the production of the recombinant human long pentraxin PTX3 protein comprising:
- the recombinant human cell expressing a recombinant human long pentraxin PTX3 protein is a recombinant HEK293F cell line, more preferably it is the recombinant
- the purification step includes at least one of the following step: anionic-exchange chromatography, hydroxyapatite chromatography or size exclusion chromatography.
- It is another object of the invention a process for the production of the recombinant human long pentraxin PTX3 protein comprising:
- It is another object of the invention a process for the production the recombinant human long pentraxin PTX3 protein comprising the step of growing the recombinant MS24PTX clone and purifying the human long pentraxin PTX3 protein from the culture medium.
- Figure 1 pSASSI-hPTX3 map and main features
- Figure 2 Growth, viability and productivity in Spinner Flask of (A) MS24PTX clone and (B)
- FIG. 4 FGF2 binding capability of hPTX3 clone 293F/PTX3/2F12 and hPTX3 clone
- Figure 5 pSCl-hPTX3 map and main features.
- the human ubiquitin C promoter is taken from pUB/Bsd plasmid (Invtrogen, Cat. n. V512-20), by amplification with PCR. As part of the cloning strategy, recognition sequences for restriction endonucleases are introduced at both ends. A BsaAI site is built in the upstream amplification primer and an EcoRI site in the downstream primer. The amplified region corresponds to nucleotides 1941 to 3161 in the sequence of pUB/Bsd.
- oligonucleotides are designed as follow:
- the protocol for amplification is the following: 1 ng/ ⁇ l of plasmid DNA, 2mM MgC12, 0,2 mM dNTPs, 40OnM of each primer, IX supplied buffer and 0,04 u/ml of Taq DNA polymerase (Sigma Genosys); temperature profile: 3 min 94°C, 30 times (30 sec. 94°C, 30 sec. 46°C, 2 min 72°C), 5 min 72°C, cooling at 4°C until further use.
- the amplification product (1238 bp) is purified by silica membrane spin column ( NucleoSpin, Machery-Nagel GmbH & Co.), ligated in pGEM-T-Easy vector (Promega Cat. n. A1360) and transformed into E.coli host strain HB2151 (Pharmacia Biotech). Transformants are selected by growth on LB medium supplemented with 50 mg/1 ampicillin
- Plasmids DNA isolated from ampicillin resistant colonies, are checked by restriction analysis with Stul plus Sad enzymes (expected ⁇ 3650 and 600 bp fragments)
- Plasmids showing the correct restriction pattern are further checked by sequence analysis of the entire insert and subsequently digested with EcoRI (Sigma-Genosys) and BsaAI (New England Biolabs) restriction enzymes.
- Human Ubiquitin C promoter is purified via agarose gel separation and elution on silica membrane spin column.
- Plasmid pSG5 (4076 bp, Stratagene) was cut with the restriction enzymes EcoRI (Sigma- Genosys) and BsaAI (New England Biolabs); the resulting fragments are 1432 and 2644 bp long.
- DNA fragments prepared in steps 1.1 and 1.2 were ligated using T4 DNA ligase (Promega) and transformed in HB2151 E. coli cells. Transformants were selected by growth on LB medium supplemented with 50 mg/1 ampicillin.
- Plasmid DNA isolated from ampicillin resistant colonies, was checked by restriction analysis with EcoRI plus SacII enzymes (expected: 2670 and 1192 bp fragments). A plasmid DNA, with the expected restriction pattern, was designed as pSG/Ub.
- Neomycin Resistance Cassette (NeoR)
- Neomycin Resistance Cassette (NeoR) was taken from pcDNA3 plasmid (5446 bp, Invitrogen), amplifying it by PCR. As part of the cloning strategy, recognition sequences for restriction endonuclease AflIII were introduced at both ends. The amplified region corresponds to nucleotides 1788 to 3252 in the sequence of pcDNA3 and includes the SV40 promoter and origin of replication, the neomycin resistance ORF, and the SV40 poliA signal.
- oligonucleotides are designed as follows: 5'NeoR (SEQ ID 5) ATATACATG TCC CCA GGC AGG CAG AA
- Protocol for amplification was the following: 1 ng/ ⁇ l of plasmid DNA, 2mM MgC12, 0,2 mM dNTPs, 40OnM of each primer, IX supplied buffer and 0,04 u/ ⁇ l of Taq DNA polymerase (Sigma Genosys); temperature profile: 3 min 94°C, 30 times (30 sec. 94°C, 30 sec. 46°C, 2 min
- the amplification product (1484 bp) was purified by silica membrane spin column, ligated in pGEM-T-Easy vector (Promega Cat. n. A1360) and transformed into E.coli host strain HB2151.
- Trans formants are selected by growth on LB medium, supplemented with 50 mg/1 ampicillin Plasmids DNA, isolated from ampicillin resistant colonies, are checked by restriction analysis with Smal plus Sad enzymes (expected ⁇ 1200 and 3300 bp fragments).
- Plasmids showing the correct restriction pattern were further checked by sequence analysis of the entire insert and subsequently digested with AfIIII (New England Biolabs) restriction enzymes.
- NeoR cassette (1471 bp) was purified via agarose gel separation and elution on silica membrane spin column.
- DNA fragments prepared as in steps 2.1 and 2.2 were ligated using T4 DNA ligase (Promega) and transformed in JMl 09 E. coli strain (New England Biolabs). Transformants were selected by growth on LB medium, supplemented with 50 mg/1 ampicillin.
- Antibiotic resistant colonies were preliminarliy analyzed by PCR amplification with 5 'NeoR and 3 'NeoR oligonucleotides, as previously described, and subsequently, purified plasmids were checked by restriction analysis.
- Smal position 602, inside NeoR sequence
- SacII position 4142, inside UbC sequence
- a plasmid DNA, with the expected restriction pattern (3540 and 1793 bp fragments) was designed as pSCl.
- hPTX3 GeneBank Accession Number BD 131701
- sequence was taken from pSG5-PTX3 (WO 99/32516 "Pharmaceutical compositions containing the long pentraxin PTX3 ) by BamHI (Roche Applied Science) digestion.
- Human PTX3 fragment 1463 bp was purified by agarose gel electrophoresis and silica membrane spin column.
- the pSCl vector was linearized by BamHI digestion and purified on silica membrane spin column.
- DNA fragments prepared in steps 3.2 and 3.3 were ligated using T4 DNA ligase (Roche Applied Science) and transformed in JM 109 E. coli strain. Transformants were selected by growth on LB medium, supplemented with 50 mg/1 ampicillin and preliminarily screened by PCR with two oligonucleotides complementary to PTX3 sequence.
- the oligonucleotides sequences are:
- reagents for amplification were: 1 ⁇ l of boiled colony (1 colony in 50ml of water), 2mM MgC12, 0,2 mM dNTPs, 32OnM of each primer, 0,06% Formamide, IX supplied buffer and 0,08 u/ ⁇ l of Taq DNA polymerase (Sigma Genosys); temperature profile: 3 min 96°C, 30 times (30 sec. 94°C, 30 sec. 58°C, 2 min 72°C), 5 min 72°C, cooling at 4°C until further use.
- Plasmid purified from colonies positive to PCR screening were digested with Sail restriction enzyme (Roche Applied Science) to check the orientation of hPTX3 insert.
- a plasmid with the expected restriction pattern (6619 and 177 bp) was sequenced in the regions coding for UbC promoter, NeoR cassette and hPTX3 and identified as pSCl-PTX3.
- the new plasmid (pSCl-PTX3) was then constructed with PTX3 cDNA sequence located under ubiquitin promoter control and neomycin resistance gene under SV40 promoter control; all other features and plasmid map are represented in figure 1.
- the complete sequence of pSCl-PTX3 is as follows (SEQ ID 2).
- the pSCl-hPTX3 sequence is represented starting from the first EcoRI site (figure 5).
- the sequence deriving from pSG5 containing PTX3 cDNA is underlined.
- the starting codon (ATG) and termination codon are in bold.
- TTTTTTGTTAGACCGGACCG A human cell line (HEK293F) has been chosen for its ability to grow in suspension and in a serum and protein free medium (Florian M Wurm “Production of recombinant protein therapeutics in cultivated mammalian cells” Nature Biotechnology 22(11): 1393-1398, 2004, Yan SC et al. "Characterization and novel purification of recombinant human protein C from three mammalian cell lines” Biotechnology (N.Y.) 1990 JuI 8 (7): 655-61. "Use of cell lines for the production of influenza virus vaccines: an appraisal of technical, manufacturing, and regulatory considerations” Initiative for Vaccine Research, World Health Organization, Geneva, Switzerland (10 Aprile 2007).
- pSCl-PTX3 plasmid was used either in a linear (Pvul digested) or in a circular form. The best transfection yield was obtained with linearized plasmid; clones selection was done on a productivity base and growth capability. After several rounds of subcloning the 2Fl 2 clone was selected.
- the human clone 2Fl 2, expressing hPTX3, has been deposited at ECACC (European Collection of Cell Cultures, Health Protection Agency, Porton Down, Wiltshire SP4 OJG, UK) on January 10, 2008, pursuant to Budapest Treaty condition under deposit number 0801 1001. The experimental details are described below.
- the medium was changed into selection medium (200 ml Freestyle medium+ 500 ⁇ g/ml of G418) and the transfected cells were plated in ten 96wells plates, 200 ⁇ l/well. After 15 days highest producers cell-pools were determined by ELISA and amplified in 24wells, ⁇ wells and T25flask.
- Recombinant cell-pools obtained were subcloned with 1 cells per well in 96wells plates, in 50% fresh medium and 50% conditioned medium.
- pCEP4 plasmid (Invitrogen cat. n. V044-50), in which was previously cloned an antibody light chain, loosing a portion of the Multiple Cloning Site and the BamHI restriction site, was cut with the restriction enzymes EcoRV and CIaI (Roche Applied Science); the digestion allowed to obtain a plasmid without the Epstein-Barr- Virus replication origin (oriP) and the nuclear antigen (encoded by the EBNA-I gene) that permit extrachromosomal replication. The resulting fragments were 6910 and 4281 bp long.
- the fragment was purified on a silica membrane spin column and ligated on itself over night at room temperature, by using T4 DNA ligase (Promega).
- TOPlO competent cells (Invitrogen) were transformed with the ligation mixture and transformants selected by growth on LB plates supplemented with 100 mg/L ampicillin.
- Plasmid DNA isolated from ampicillin resistant colonies, was designed as pCEPlight ⁇ .
- the Hygromycin Resistance Cassette together with the cytomegalovirus (CMV) immediate early enhancer/promoter was taken from pCEPlight ⁇ amplifying it by PCR.
- recognition sequence for restriction endonuclease BamHI was introduced in the oligonucleotide annealing to the 3' end of CMV promoter.
- the amplified region about 5500 bp included CMV promoter, Hygromycin gene under the control of TK promoter together with TK polyA signal.
- the oligonucleotide are designed as follows:
- oligo CMV (SEQ ID 9) 5 'GAGAACTGTAACGTTGGATCCAGCTGG S '
- Protocol for amplification was the following: 2 ng of pCEPlight ⁇ , 20OnM of each primer, 0,2 mM dNTPs, IX supplied buffer, 1.5 ⁇ l DMSO, 0.5 ⁇ l Taq DNA polymerase (Phusion), final volume 50 ⁇ l; temperature profile: 1 min 98°C, 35 times (10 sec. 98°C, 30 sec. 55°C, 3 min. 72°C), 10 min. 72°C, cooling at 4°C until further use.
- the amplification product (-5500 bp) was purified via agarose gel electrophoresis plus silica membrane spin column. Purified fragment was ligated to itself and use to transform TOPlO competent cells (Invitrogen). Plasmid DNA, isolated from ampicillin resistant colonies, was checked by restriction and sequence analysis, and was designed as pCEP ⁇ Bam.
- hPTX3 GeneBank Accession Number BD 131701
- sequence was taken from pSCl-PTX3 as indicated above by BamHI (Roche Applied Science) digestion.
- Human PTX3 fragment (1463 bp) was purified by agarose gel electrophoresis and silica membrane spin column.
- the pCEP ⁇ Bam vector was linearized by BamHI digestion and purified on silica membrane spin column.
- pCEP ⁇ Bam linearized and DNA fragment corresponding to hPTX3 gene prepared in step 3 were ligated using T4 DNA ligase (Roche Applied Science) and used to transform TOPlO E. coli strain.
- Transformants were selected by growth on LB medium, supplemented with 100 mg/L ampicillin and preliminarily screened restriction analisys to evaluate PTX3 fragment orientation.
- the SV40 polyA signal was taken from pCEP ⁇ light plasmid amplifying it by PCR.
- recognition sequences for restriction endonucleoases HindIII and Xhol were introduced at fragment ends respectively.
- oligonucleotides were designed as follows:
- PCEPSVH (SEQ ID 11) 5 'AAGCTT AGAC ATGAT AAGAT AC ATTG 3'
- PCEPSVX (SEQ ID 12) 5'CTCGAGAGTCGACCGGTCATGGCTGC 3' Protocol for amplification was the following: 1 ng of pCEPlight ⁇ , 20OnM of each primer, 0,2 mM dNTPs, IX supplied buffer, 2 ⁇ l MgC12 5OmM, 0.5 ⁇ l Taq DNA polymerase (Invitrogen), final volume 50 ⁇ l; temperature profile: 1 min 94°C, 30 times (30 sec. 94°C, 1 min. 55°C, 1 min. 72°C), 15 min. 72°C, cooling at 4°C until further use.
- the amplification product (-420 bp) was purified via agarose gel electrophoresis plus silica membrane spin column.
- Purified fragment corresponding to SV40 polyA signal and pCEP ⁇ Bam-hPTX3 were digested with Hindlll/Xhol restriction enzymes and ligated using T4 DNA ligase (Promega). Ligation mixture was used to transform TOPlO competent cells (Invitrogen) and transformants were selected by growth on LB plates containing 100 mg/L of ampicillin.
- the complete sequence of pSASSI-HPTX3 is as follow (SEQ ID 1).
- the pSASSI-hPTX3 sequence is represented starting from the BamHI site (figure 1).
- the sequence of hPTX3 is in small letters.
- the starting codon (atg) and the termination codon (taa) are in bold.
- TAGTAGTATA TACTATCCAG ACTAACCCTA ATTCAATAGC ATATGTTACC CAACGGGAAG 2340 CATATGCTAT CGAATTAGGG TTAGTAAAAG GGTCCTAAGG AACAGCGATC GATGATAAGC 2400
- GTAACTGTCA GACCAAGTTT ACTCATATAT ACTTTAGATT GATTTAAAAC TTCATTTTTA 3540 ATTTAAAAGG ATCTAGGTGA AGATCCTTTT TGATAATCTC ATGACCAAAA TCCCTTAACG 3600
- CTCTGTAGCA CCGCCTACAT ACCTCGCTCT GCTAATCCTG TTACCAGTGG CTGCTGCCAG 3900 TGGCGATAAG TCGTGTCTTA CCGGGTTGGA CTCAAGACGA TAGTTACCGG ATAAGGCGCA 3960
- GCGAACGCCA GCAAGACGTA GCCCAGCGCG TCGGCCGCCA TGCCCTGCTT CATCCCCGTG 4800 GCCCGTTGCT CGCGTTTGCT GGCGGTGTCC CCGGAAGAAA TATATTTGCA TGTCTTTAGT 4860
- CAGTCGGGGC GGCGCGGTCC CAGGTCCACT TCGCATATTA AGGTGACGCG TGTGGCCTCG 4980
- CTCTCGATGA GCTGATGCTT TGGGCCGAGG ACTGCCCCGA AGTCCGGCAC CTCGTGCACG 5640
- TATTAGTCAT CGCTATTACC ATGGTGATGC GGTTTTGGCA GTACACCAAT GGGCGTGGAT 7260
- the medium was changed into selection medium (200 ml Freestyle medium+ 200 ⁇ g/ml of Hygromycin) and the transfected cells were plated in ten 96wells plates, 200 ⁇ l/well. After 15 days highest producers cell-pools were determined by ELISA and amplified in 24wells, ⁇ wells and T25 flask.
- Recombinant cell-pools obtained were subcloned with 1 cells per well in 96wells plates, in 50% fresh medium and 50% conditioned medium.
- Purified PTX3 or PTX3 secreted in the culture supernatant were titrated using a sandwich ELISA.
- 96-well Nunc Maxisorb microtiter plates (Nunc, Roskilde, Denmark) were coated overnight, at 4°C, with 700 ng/ml of the rat monoclonal antibody MNB4 anti-human PTX3 (AlexisTM Biochemicals, Lausen, Switzerland) in 15mM sodium carbonate buffer, pH 9.6.
- Wells were washed with PBS plus 0.05% Tween-20 (PBS-Tw, washing solution) and blocked with 300 ⁇ l of PBS-Tw containing 5% dry milk, for 2 hours at room temperature.
- Figure 2 shows the growth, viability and productivity of the MS24PTX (panel A) and 293F/PTX3/2F12 (panel B) clones in the same seeding and growing conditions.
- PTX3 expressing clone 293F/PTX3/2F12
- CMV promoter a new plasmid in which PTX3 is under the control of CMV promoter
- the PTX3 -containing fraction was concentrated and buffer changed on a ultrafiltration membrane (Pellicon-Biomax 100, Millipore) than characterized by Size Exclusion Chromatography on Biosep SEC S4000 (Phenomenex) and SDS-PAGE ( Figure 3).
- a ultrafiltration membrane Pellicon-Biomax 100, Millipore
- Size Exclusion Chromatography on Biosep SEC S4000 Phenomenex
- SDS-PAGE Figure 3
- the binding of purified recombinant hPTX3 to FGF2 was assessed in an ELISA system.
- a 96- wells plate (Falcon 3912) was coated with 2 ⁇ g/ml of FGF2 (Calbiochem) in PBS and incubated overnight at 4°C.
- Wells were washed with PBS plus 0.1% Triton X-100 (PBS-Tr, washing solution) and blocked with 200 ⁇ l of PBS-Tr containing 3% BSA (PBS-B blocking and diluent solution) for 2 hours at room temperature.
- PBS-Tr Triton X-100
- binding was performed adding 100 ⁇ l of samples, diluted in PBS-B at PTX3 concentrations ranging from 0 to 120 ng/ml, and incubating the plate at 37°C for 1 hr. After wash, plates were incubated with 100 ⁇ l/well of 100 ng/ml rabbit anti-PTX3 polyclonal antibody (1 hr at 37°C), washed again and incubated with 100 ⁇ l of horseradish peroxidase-labeled goat anti-rabbit IgG (1 :1000 in PBS-B; 1 hr at 37°C).
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Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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EP10740573.0A EP2459721B1 (en) | 2009-07-29 | 2010-07-20 | Improved human long pentraxin 3 expression system and uses thereof |
PL10740573T PL2459721T3 (en) | 2009-07-29 | 2010-07-20 | Improved human long pentraxin 3 expression system and uses thereof |
MEP-2013-126A ME01566B (en) | 2009-07-29 | 2010-07-20 | Improved human long pentraxin 3 expression system and uses thereof |
SI201030362T SI2459721T1 (en) | 2009-07-29 | 2010-07-20 | Improved human long pentraxin 3 expression system and uses thereof |
CY20131100942T CY1116486T1 (en) | 2009-07-29 | 2013-10-25 | IMPROVED HUMAN LONG PENTRAXIN 3 EXPRESSION SYSTEM AND ITS USES |
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EP09166759 | 2009-07-29 | ||
EP10740573.0A EP2459721B1 (en) | 2009-07-29 | 2010-07-20 | Improved human long pentraxin 3 expression system and uses thereof |
PCT/EP2010/060469 WO2011012496A1 (en) | 2009-07-29 | 2010-07-20 | Improved human long pentraxin 3 expression system and uses thereof |
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EP2459721A1 true EP2459721A1 (en) | 2012-06-06 |
EP2459721B1 EP2459721B1 (en) | 2013-09-18 |
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US (1) | US8883446B2 (en) |
EP (1) | EP2459721B1 (en) |
JP (1) | JP5859963B2 (en) |
KR (1) | KR101767695B1 (en) |
CN (1) | CN102549160B (en) |
AU (1) | AU2010277786B2 (en) |
BR (1) | BR112012001980A2 (en) |
CA (1) | CA2769257C (en) |
CY (1) | CY1116486T1 (en) |
DK (1) | DK2459721T3 (en) |
EA (1) | EA023191B1 (en) |
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HK (1) | HK1172649A1 (en) |
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PT (1) | PT2459721E (en) |
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US10253321B2 (en) | 2013-05-01 | 2019-04-09 | Dna2.0, Inc. | Methods, compositions and kits for a one-step DNA cloning system |
US9206433B2 (en) * | 2013-05-01 | 2015-12-08 | Dna Twopointo, Inc. | Methods, compositions and kits for a one-step DNA cloning system |
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CA2492008C (en) * | 2002-03-29 | 2012-06-26 | Xoma Technology Ltd. | Multigenic vectors plasmids and methods for increasing expression of recombinant polypeptides |
EP1832295A1 (en) * | 2006-03-10 | 2007-09-12 | Tecnogen S.P.A. | Use of PTX3 for the treatment of viral diseases |
WO2009095403A1 (en) * | 2008-01-29 | 2009-08-06 | Tecnogen S.P.A. | Expression system and uses thereof for the production of human long pentraxin 3 |
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CY1116486T1 (en) | 2017-03-15 |
EA023191B1 (en) | 2016-05-31 |
DK2459721T3 (en) | 2013-11-04 |
KR20120047259A (en) | 2012-05-11 |
CA2769257A1 (en) | 2011-02-03 |
CN102549160B (en) | 2014-04-02 |
ME01566B (en) | 2014-09-20 |
BR112012001980A2 (en) | 2015-09-01 |
US20120301873A1 (en) | 2012-11-29 |
SI2459721T1 (en) | 2013-11-29 |
PT2459721E (en) | 2013-10-31 |
IL217696A (en) | 2017-06-29 |
EA201200198A1 (en) | 2012-06-29 |
KR101767695B1 (en) | 2017-08-11 |
JP2013504304A (en) | 2013-02-07 |
EP2459721B1 (en) | 2013-09-18 |
CA2769257C (en) | 2017-12-05 |
AU2010277786A1 (en) | 2012-03-01 |
ES2432242T3 (en) | 2013-12-02 |
SG177756A1 (en) | 2012-02-28 |
JP5859963B2 (en) | 2016-02-16 |
HRP20130947T1 (en) | 2013-11-08 |
AU2010277786B2 (en) | 2016-04-14 |
CN102549160A (en) | 2012-07-04 |
MX2012001109A (en) | 2012-03-26 |
HK1172649A1 (en) | 2013-04-26 |
PL2459721T3 (en) | 2014-01-31 |
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